It's hard to say what caused the accident.

很难说造成事故的原因是什么。

《牛津词典》

It's hard to say at this stage how the market will develop.

在现阶段很难说市场会如何发展。

《柯林斯英汉双解大词典》

She finds it hard to say what she feels.

她觉得心里的感受难以言述。

《牛津词典》

Experts say it will be hard to find a nominee with as much experience in both health issues and politics.

VOA: special.2009.02.06

The last thing I want to say about hashes are that they're actually really hard to create.

最后我想说的是哈希函数非常难以创立,在过去的时间里。

麻省理工公开课 - 计算机科学及编程导论课程节选

So, I think it's this balance between working very hard and being involved in the greater community, I would say.

所以，一方面要努力学习，一方面要参与大型社会活动，我想，他们需要把握好平衡。

图书馆经常人很多 - SpeakingMax英语口语达人

But Mr Netanyahu and his coalition partners on the hard right say that is too generous.

ECONOMIST: The Middle East peace process

Whether or not that happens by Copenhagen at this point is just hard to say.

WHITEHOUSE: Press Briefing

How much of this has filtered through to actually policy is hard to say.

BBC: Why not let social media run the country?